In the given figure, CD and AB are diameters of circle and AB and CD are perpendicular to each other. LQ and SR are perpendiculars to AB and CD respectively. Radius of circle is 5 cm, PB : PA = 2 : 3 and CN : ND = 2 : 3. What is the length (in cm) of SM?

A

$$[(5\surd3) - 3]$$

B

$$[(4\surd3) - 2]$$

C

$$[(2\surd5) - 1]$$

D

$$[(2\surd6) - 1]$$